One improvement is to use this for the last line:

/path/to/program/requiring/256/colors ; kill -9 %1

Then when you close the 8-bit program that you invoked, the script will kill the new instance of Xquartz (which appears as a blank white icon in the dock).

If you want to test this, make the script executable and replace the last line with, for example,

/usr/X11R6/bin/xclock ; kill -9 %1




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